A. Built-in white plate parameters. No need to calibrate each time which realize rapid measurement. b. Double Locating: Illuminating locating and precise cross locating. c. Switchable Double Measurement End Face: Large stable end face and small concave-convex end face. d. New Integrating Sphere Optical Path Design: Eliminating the stray light of main optical path and auxiliary optical path. Possessing the highest measurement stability and precision. e. 4mm Measuring Aperture.